The Respiratory System

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2 How it will be evidencedPoster including:Label a diagram of the respiratory system.Describing the functions of all the major parts of the respiratory system.Mechanics of breathingInspirationExpirationGaseous exchangeAlveoliDiffusion of oxygen into the bloodCarbon dioxide out of the blood and into the lungs

3 Labelling the Respiratory SystemIntercostal Muscles – Found between the ribs, contracting and relaxing during the breathing process.Epiglottis – This is a tiny flap of cartilage and the back of the tongue. It covers the windpipe during swallowing.Trachea (Windpipe) – Has rings of cartilage along its length to allow the tube to be flexible and to keep the airway open.Alveoli – Tiny air sacs; there are millions in the lungs. Gaseous exchange takes place here. Their walls are thin so that gases can pass through them. They are covered with millions of capillaries. Each alveoli is smaller than grain of salt.Bronchioles – Smaller sub-divisions of the bronchi leading to the alveoli.Diaphragm – Sheet of muscle dividing the chest cavity and the abdominal cavity.Bronchus – Two tubes that branch from the trachea to continue the air flow nearer to the lungs.

4 Gaseous ExchangeBlood carries carbon dioxide from the body to the capillaries next to the alveoli.The carbon dioxide passes through the capillary walls and into the alveoli.From here it travels out of the lungs and up the windpipe. You then breathe it out.Diffusion of the oxygen into the blood is the process of oxygen passing through the alveoli and into the capillaries.The blood carries the oxygen away to the body.